The asteroid impact that ended the age of the dinosaurs also released so much carbon dioxide into the atmosphere that the planet warmed up by about 5 degrees Celsius — and the hot spell persisted for roughly 100,000 years.

That's according to a new study in the journal Science that offers a cautionary tale about how Earth's climate will react to the carbon dioxide that's being pumped into the atmosphere now by the burning of fossil fuels.

After President Trump abruptly called off a June 12 meeting with North Korea's Kim Jong Un to discuss nuclear disarmament, the leader of South Korea is trying to parse the meaning — and the fallout — of the cancellation, as other world leaders express dismay.

South Korean President Moon Jae-In said he was "very perplexed" by the decision, which he called "very regrettable," according to the South Korean news agency Yonhap.

Up to four major hurricanes could form in the Atlantic this hurricane season, according to the annual forecast from NOAA's Climate Prediction Center.

The Atlantic hurricane season runs from June 1 to Nov. 30. Overall, the season will likely be normal or somewhat more intense than normal, the National Oceanic and Atmospheric Administration says, with a 25 percent chance that hurricane activity will be below normal.

Sidney Jones (@sidneyIPAC) is director of the Institute for Policy Analysis of Conflict in Jakarta, Indonesia.

Indonesia is still in a state of shock after a horrifying series of terrorist attacks across the country last week. In East Java, members of three pro-ISIS families tried to carry out separate but coordinated suicide bombings.

One family of six split up and attacked three churches. All of the bombers — mother, father, two teenage sons and two daughters, ages 9 and 12 — were killed, together with 12 churchgoers.

The U.S. takes credit for creating the Internet, and the European Union seems determined to govern it. On Friday, a sweeping new directive goes into effect called the General Data Protection Regulation, or GDPR. Taken together, its 99 articles represent the biggest ever change to data privacy laws. The new rules have implications for U.S. Internet users too.

Here are answers to three questions you might have about the new law and its potential impacts.

Well, it looks like the summit is now off. President Trump has canceled his proposed meeting with the leader of North Korea. This announcement came on the same morning that North Korea made a very public showing destroying a very important nuclear test site.

More than a dozen U.S. Air Force airmen were linked to a drug ring at a base that controls America's nuclear missiles and have faced disciplinary actions – including courts martial, according to an investigation by The Associated Press.

Military investigators cracked the ring in 2016, after one of the service members made the mistake of posting drug-related material to social media.

Investigators looking into the downing of Malaysia Airlines Flight 17, which was shot down over eastern Ukraine in July 2014, say the Russian missile that hit the plane originated from a Russian military unit.

The passenger jet crashed, killing all 298 people aboard. Moscow has denied being responsible.

A jury in Georgia has awarded $1 billion to a young black woman who was raped by an armed security guard when she was 14.

Jurors in Clayton County, Ga., on Tuesday awarded $1 billion in damages to Hope Cheston, now 20, in a civil lawsuit against the company that employed the man who raped her outside an apartment complex.

Cheston's attorney, L. Chris Stewart, called it a "record" amount. "Juries are saying no to sexual assault and holding companies accountable!" he wrote on Twitter.

President Trump has called off a highly anticipated June 12 summit with North Korean leader Kim Jong Un.

"Sadly, based on the tremendous anger and open hostility displayed in your most recent statement, I feel it is inappropriate, at this time, to have this long planned meeting," Trump wrote in a letter to Kim.

Donald Trump and his party are gearing up for a hard-fought midterm election. But the president loves to campaign and he's already started to raise lots of money and hold lots of big rallies for Republicans.

It's part of a larger playbook that his advisers think can keep the GOP in power this fall, and they think so far it's on track, despite the president's tendency to go off script on Twitter or during political speeches.

The nation's opioid epidemic has been attributed to many factors, including the over-prescription of painkillers and the availability of cheap synthetic opioids like fentanyl.

In Congress, lawmakers are trying to make it harder to buy fentanyl, in part by forcing the U.S. Postal Service to make it more difficult to send narcotics through the mail. But the measure has been languishing.

The White House said Thursday it doesn't see a problem with Chief of Staff John Kelly attending a briefing at which intelligence and law enforcement leaders brief members of Congress on secret information about the Russia probe.

I "don't see what the issue is," one official told NPR.

President Trump's new lawyer for the Russia matter, Emmet Flood, also attended at least part of one briefing. TV footage showed Flood arriving for a meeting on Capitol Hill.